Standard BioTools CFO has 28K shares withheld

STANDARD BIOTOOLS INC.

Rhea-AI Filing Summary

STANDARD BIOTOOLS INC. (LAB) reported that Chief Financial Officer Hanjoon Alex Kim had 28,195 shares of common stock withheld on August 20, 2026 to satisfy tax withholding obligations arising from the vesting of previously granted restricted stock units. This was a code F transaction, meaning shares were delivered or withheld for tax payment rather than sold in the open market. After this withholding, Kim directly held 2,534,859 shares of STANDARD BIOTOOLS common stock.

Insider Trade Summary

Tax Withholding: 28,195 shares

Tax Withholding 1 txn

Insider Kim Hanjoon Alex

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	28,195	$0.672	$19K

Holdings After Transaction: Common Stock — 2,534,859 shares (Direct)

Footnotes (1)

1. F1. The shares were withheld from the reporting person to satisfy the tax withholding obligations that arose upon the vesting of restricted stock units granted to the reporting person on May 20, 2024, March 21, 2025 and March 20, 2026, which grants were originally reported on Form 4s filed with the U.S. Securities and Exchange Commission on May 21, 2024, March 24, 2025 and April 8, 2026 respectively.

Key Figures

Shares withheld for tax: 28,195 shares Price per share: $0.6720 per share Shares owned after transaction: 2,534,859 shares

3 metrics

Shares withheld for tax 28,195 shares Common stock withheld on August 20, 2026 for tax withholding obligations (code F)

Price per share $0.6720 per share Value applied to the 28,195 withheld shares in the code F transaction

Shares owned after transaction 2,534,859 shares Direct holdings of CFO Hanjoon Alex Kim after the August 20, 2026 transaction

Key Terms

restricted stock units, tax withholding obligations, Form 4

3 terms

restricted stock units financial

"tax withholding obligations that arose upon the vesting of restricted stock units granted"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax withholding obligations financial

"shares were withheld from the reporting person to satisfy the tax withholding obligations"

Form 4 regulatory

"originally reported on Form 4s filed with the U.S. Securities"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did STANDARD BIOTOOLS (LAB) report for its CFO?

The CFO, Hanjoon Alex Kim, had 28,195 shares of STANDARD BIOTOOLS common stock withheld on August 20, 2026 to cover tax withholding obligations from vesting restricted stock units. This was a code F Form 4 transaction, not an open-market sale.

How many STANDARD BIOTOOLS (LAB) shares does the CFO hold after this Form 4 transaction?

After the August 20, 2026 tax-withholding transaction, CFO Hanjoon Alex Kim directly held 2,534,859 shares of STANDARD BIOTOOLS common stock, as reported in the Form 4 filing.

What does the code F transaction mean in the STANDARD BIOTOOLS (LAB) Form 4?

Code F in the Form 4 indicates payment of tax liability by delivering or withholding securities. For STANDARD BIOTOOLS, 28,195 shares were withheld from CFO Hanjoon Alex Kim to satisfy tax withholding obligations on vested restricted stock units.

Were the STANDARD BIOTOOLS (LAB) shares sold on the market in this Form 4?

No. The Form 4 states that 28,195 shares were withheld to satisfy tax withholding obligations from restricted stock unit vesting, a code F transaction. It does not report an open-market purchase or sale by the CFO.

Which equity awards caused the tax withholding in the STANDARD BIOTOOLS (LAB) Form 4?

The tax withholding arose from the vesting of restricted stock units granted to CFO Hanjoon Alex Kim on May 20, 2024, March 21, 2025, and March 20, 2026, as referenced in earlier Form 4 filings.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/24/2026 - 05:06 PM EDT Accepted by SEC EDGAR 08/24/2026 - 05:05 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Kim Hanjoon Alex

(Last) (First) (Middle)

C/O STANDARD BIOTOOLS INC.

50 MILK STREET, 10TH FLOOR

(Street)

BOSTON MASSACHUSETTS 02109

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
STANDARD BIOTOOLS INC. [ LAB ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/20/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/20/2026		F		28,195(1)	D	$0.672	2,534,859	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The shares were withheld from the reporting person to satisfy the tax withholding obligations that arose upon the vesting of restricted stock units granted to the reporting person on May 20, 2024, March 21, 2025 and March 20, 2026, which grants were originally reported on Form 4s filed with the U.S. Securities and Exchange Commission on May 21, 2024, March 24, 2025 and April 8, 2026 respectively.

	/s/ Hanjoon Alex Kim by Tomone Tanaka, Attorney-in-Fact	08/24/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)